QuickFacts

The population of Illinois is

12,859,995

23.7%

of persons in Cook County, Illinois are under 18 years

The population of Cook County, Illinois is

5,246,456

The population of Maricopa County, Arizona is

4,087,191

21.3%

of persons in Florida are under 18 years

12.1%

of persons in Maricopa County, Arizona are 65 years and over

10.7%

of persons in Georgia are 65 years and over

10.5%

of persons in Los Angeles city, California are 65 years and over

10.9%

of persons in Los Angeles County, California are 65 years and over

Population per square mile in New York is

411.2

Source: Population Estimates

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census